Let's introduce two helpers that allow to DMA map/unmap a RAM section. Those helpers will be called for nested stage setup in another call site. Also the vfio_listener_region_add/del() structure may be clearer. Signed-off-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com> Signed-off-by: imxcc <xingchaochao@huawei.com> (cherry picked from commit 68e372b0530d234ce4a3facb486d401595cf59ba)
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